Aircraft Repair and Maintenance Quiz

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Questions and Answers

What would indicate partial bearing failure in a removed rivet shank?

Corrosion

Joggles (correct)

Torsion failure

Shear failure

What is the minimum allowable overlap for a double row of 1/8-inch rivets in a single-lap sheet splice?

1 inch

½ inch (correct)

¾ inch

13/16 inch

What is the diameter of an MS20430AD-4-8 rivet?

1/4 inch

4/16 inch

1/8 inch (correct)

1/2 inch

What may indicate less than full strength curing of the matrix when inspecting a composite panel using the ring test/tapping method?

A dull thud Signup and view all the answers

What is added to wet resins to provide strength for the repair of damaged fastener holes in composite panels?

Fibers Signup and view all the answers

What is the length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch sheet, drilled with a No. 30 drill?

5/16 inch Signup and view all the answers

What is the purpose of heat treating a rivet just prior to being driven?

To make it more flexible Signup and view all the answers

What is the length of rivets to be used when making a sheet metal repair with two pieces of 0.040-inch aluminum riveted together with 3/32-inch rivets?

¼ inch Signup and view all the answers

What is the correct radius of a bend, unless otherwise specified?

Inside radius plus one-half the thickness of the metal being formed Signup and view all the answers

What is the maximum size of damage that can be repaired using a potted compound on honeycomb structures?

2 inches in diameter Signup and view all the answers

When using a reamer to finish a drilled hole to the correct size, what is the correct procedure?

Turn the reamer in the cutting direction when enlarging the hole and in the opposite direction to remove from the hole Signup and view all the answers

What is the primary factor that determines the strength and stiffness of a properly constructed composite buildup?

The ratio of matrix to fiber Signup and view all the answers

What is the preferred method for making permanent repairs on composite materials?

Bonding on metal or cured composite patches Signup and view all the answers

What is the purpose of treating surfaces to be riveted together with an anodic treatment?

To prevent an electrolytic action when riveting dissimilar metals Signup and view all the answers

Which of the following parts of a semi-monocoque fuselage prevents tension and compression from bending the fuselage?

Longerons and stringers Signup and view all the answers

What is the process called when repairing shallow scratches in sheet metal?

Burnishing Signup and view all the answers

What is the primary structural component of a monocoque fuselage?

Skin or covering Signup and view all the answers

What is the minimum consideration when determining rivet spacing?

All of the above Signup and view all the answers

How can you distinguish between aluminum and aluminum alloy?

Not specified in the content Signup and view all the answers

What is the main purpose of microballoons in a composite repair?

To create a gap or space in the composite material Signup and view all the answers

What information can be identified on the head of a Dzus fastener?

Body diameter, type of head, and length of the fastener Signup and view all the answers

What is the correct size of Flox, which is a type of chapped fiber?

1/4 inch Signup and view all the answers

What is the critical factor in ensuring the strength of a rivet joint?

The surface preparation of the metals being joined Signup and view all the answers

Which of the following statements is true about a semi-monocoque fuselage?

It has a framework of longerons and stringers that provides structural integrity Signup and view all the answers

Study Notes

Rivet Formation and Repair

In forming a shop head, cold working of the rivet metal is used.
Using less catalyst than normal can make the repair more flexible.
Heat treating just prior to being driven can also be used.

Rivet Dimensions and Overlap

An MS20430AD-4-8 rivet has a diameter of 1/8 inch and a length of ¼ inch.
For a single-lap sheet splice, a minimum allowable overlap of ½ inch is required for 1/8-inch rivets.

Composite Panel Inspection and Repair

A dull thud during a ring test/tapping method may indicate less than full strength curing of the matrix or separation of the laminates.
Microballoons, Flox, and chapped fibers can be added to wet resins to provide strength for the repair of damaged fastener holes in composite panels.

Rivet and Hole Finishing

When using a reamer to finish a drilled hole, it should be turned in the cutting direction when enlarging the hole and in the opposite direction when removing from the hole.
Apply considerable pressure on the reamer when starting the cut and reduce the pressure when finishing the cut.

Fuselage Structure and Repair

A semi-monocoque fuselage relies on the strength of longerons and stringers to prevent tension and compression from bending the fuselage.
Potted compound repairs on honeycomb can usually be made on damages less than 2 inches in diameter.
Shallow scratches in sheet metal may be repaired by burnishing.

Fasteners and Composites

The markings on the head of a Dzus fastener identify the body diameter, type of head, and length of the fastener.
The strength and stiffness of a properly constructed composite buildup depend on the orientation of the plies to the load direction and the ability of the fibers to transfer stress to the matrix.
When riveting dissimilar metals together, precautions must be taken to prevent electrolytic action.

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Description

Test your knowledge of aircraft repair and maintenance procedures, including rivet repair and metal working techniques.